linux-kernel - [syzbot] KMSAN: uninit-value in reiserfs_new

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Message-ID: <00000000000027f81605ee31ab88@google.com>
Date:   Wed, 23 Nov 2022 22:39:35 -0800
From:   syzbot <syzbot+6450929faa7a97cd42d1@...kaller.appspotmail.com>
To:     brauner@...nel.org, damien.lemoal@...nsource.wdc.com,
        edward.shishkin@...il.com, glider@...gle.com, jack@...e.cz,
        jlayton@...nel.org, linuszeng@...cent.com,
        linux-kernel@...r.kernel.org, reiserfs-devel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: [syzbot] KMSAN: uninit-value in reiserfs_new_inode (2)

Hello,

syzbot found the following issue on:

HEAD commit:    ddce02aa9c40 net: kmsan: check sk_buffs passed to __netdev..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1200559b880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1429f86b132e6d40
dashboard link: https://syzkaller.appspot.com/bug?extid=6450929faa7a97cd42d1
compiler:       clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/40435685a7d7/disk-ddce02aa.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4960172e71de/vmlinux-ddce02aa.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5d91bc515d95/bzImage-ddce02aa.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6450929faa7a97cd42d1@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in reiserfs_new_inode+0x193a/0x24e0 fs/reiserfs/inode.c:2050
 reiserfs_new_inode+0x193a/0x24e0 fs/reiserfs/inode.c:2050
 reiserfs_create+0x738/0xe60 fs/reiserfs/namei.c:668
 lookup_open fs/namei.c:3413 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x28e9/0x5600 fs/namei.c:3710
 do_filp_open+0x249/0x660 fs/namei.c:3740
 do_sys_openat2+0x1f0/0x910 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_creat fs/open.c:1402 [inline]
 __se_sys_creat fs/open.c:1396 [inline]
 __ia32_sys_creat+0xed/0x160 fs/open.c:1396
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578
 alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285
 alloc_slab_page mm/slub.c:1794 [inline]
 allocate_slab+0x1b5/0x1010 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3117 [inline]
 reiserfs_alloc_inode+0x5e/0x140 fs/reiserfs/super.c:642
 alloc_inode+0x83/0x440 fs/inode.c:259
 iget5_locked+0xa5/0x200 fs/inode.c:1241
 reiserfs_fill_super+0x212b/0x3a00 fs/reiserfs/super.c:2053
 mount_bdev+0x508/0x840 fs/super.c:1401
 get_super_block+0x49/0x60 fs/reiserfs/super.c:2601
 legacy_get_tree+0x10c/0x280 fs/fs_context.c:610
 vfs_get_tree+0xa1/0x500 fs/super.c:1531
 do_new_mount+0x694/0x1580 fs/namespace.c:3040
 path_mount+0x71a/0x1eb0 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x734/0x840 fs/namespace.c:3568
 __ia32_sys_mount+0xdf/0x140 fs/namespace.c:3568
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 0 PID: 3857 Comm: syz-executor.2 Not tainted 6.1.0-rc6-syzkaller-63553-gddce02aa9c40 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
=====================================================


---
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